Academic CentreProject "One centimeter precision geoid model of Latvia for GNSS measurements" Stage 3 (April 2015 - August 2015)
Geoid model determination was accomplished using DFHRS (Digital Finite-element Height Reference Surface) software. As input data was used 1st and 2nd order levelling/GNSS data, as well as adapted geoid models.
The test results already achieved high precision geoid model even using a small number of levelling/GNSS points. The input data file has been updated with new measurements, which were obtained during the project, thereby was carried out the gradual improvement of the experimental geoid model. Besides gravimetric measurement methods, the method used in the project - DFHRS levelling/GNSS data, as well as public available data sets give an opportunity to obtain the best results. Geoid model controls were performed, using the control measurements on the whole region. Other global gravity field models that are available free in ICGEM home page (http://icgem.gfz-potsdam.de/ICGEM/) were tested and used for the calculations.
Geoid model of Vidzeme and Latgale regions was obtained with an accuracy of approximately 1 centimetre, by applying such methodology for data acquisition and processing, to enable development of the model for the whole area of Latvia.
New geoid model was developed with more efficient methods – using levelling point data and fitting with GNSS determined ellipsoidal heights, as well as vertical deflection measurements to ensure high geoid model accuracy and resolution.
2 publications about measurements of digital zenith camera and the obtained results, as well as high precision geoid model are prepared. The publications will perform all research activities of the project and achieved results.
The results of the research will be ensured by the commercialisation of knowledge and technology transfer. An intellectual property licensing agreement will be signed during one year after the end of the project. LU GGI will continue product promotion with scientific activities - presentations at conferences, publications etc.